there's someone who does these kind of alterations upstairs in the row of shops in Stillorgan opposite DID - I know several people who've used them in the past & all were very happy - sorry I don't know the name / number - haven't used them myself.....
1. There's a tailor upstairs opposite the old Dundrum Shopping Centre on the Main Street - anybody will direct you - he's a gentleman to boot! Mr John McKeever, 8 Main Street. Phone 2986241
2. Des Byrne at No 5 Grafton Street - upstairs near the Sony Shop opposite River Island - highly recommended.